Speed governing mechanism



Jan. 12, 1932. LEROY WOTTRING SPEED GO VEPNING MECHANISM Filed Oct. 2, 1929 ATT RNEYm adapts-ibi Patented Jan. 12, 1932 in non we'mnme, or scream, onro e smc Zlpplzlcction filed notches 2 serial No. 833,912.

This invention relates to speed governing mechanisms and particularly to speed governing mechanisms of the friction or brake hype.

@ne of the objects of this invention is to provide improved governing mechanism by which the speed of a motor such as an electric motor be maintained consizant.

Anosher object is to provide a speed gov sizing mechenism of which the constant speed is rendered adjustable in an improved manner.

.linocner objeca is to provide a combined motor and speed governing mechanism for driving liming mechanisms such as mechanisms for controlling nine lamps.

Another object is he provide, in a combined motor end governing mechanism therefor, unisaiy structure of motor armature and govenning mechanism.

Another object isto provide, in a combined motor end speed governingmechanism there- "for, a uniatary structure of mocor armature, shefi, governing mechanism and speed adjustment elements.

Another object is to provide a unitary rotor structure for motors and governing mechanism therefor comprising a motor armature,

speed governing mechanism, s d adjusement elements and power take-o elements.

Another ob ect is to provide, in a combined motor and sd governing mechanism therefor, a unitary structure comprising a motor shaft upon which are linearly mounted c. motor armature, a speed governing mechanism and power sake-oil? and the speed governing mechanism of which is adspied to be edjugslted by a'djustablymoving the shaft eiua y.

Another object is to provide, in a combined motor and speed governing mechanism there. for, a unitary structure of motor armature,

shai'hand governing mechanism, wherein the governin speed may be adjusted by bodily moving t e motor armature and governing mechanism and shaft in -the axial direction of the shaft.

a Another object is to provide a speed verning mechanism for motors which be of simple desi n, cheap to manufacture and assemble and e cient in operation.

Qther objects will be apperent to chose skilled in the eri; to which my invention per- "seine.

My invention is fully disclosed in the iollowing description taken in connection with the accompanying drawings, in which Fig. l is e vertical cross-sectional view of 'ihe preferred embodiment of my invention;

Fig". 2 is an elevaiional view of a part oi ll taken from lzhe plane 2 of Fig. 1.

Referring lo the drewin s, I have shown at l a main housing prefers ly formed from casi: metal. The housing 1 may-have feet 2 by which ii may he supported and by which it may be mounted in suitable relation to other apparatus with which it may be opere'iively associated. The housing 1 may be made in two or more pieces to eniirely onclose the parts therein, which are to be descrihed, and the pieces of the housing 1 may be .sealedly connected together in an preferred manner well lmown in this en. 0 seal the contents of the housing 1 to retain lubricani, therein, etc. g

Mounted on the left hand end of the housing 1, as viewed in the drawings, is a motor frame 3 provided with feet or flanges ie-4 by which through the agency of screws 5-5 the frame 3 is secured to the housing 1.

Inthe frame 3 is supported an electric mo tor of any known or suitable construction. The details of the motor are not deemed os-' sential to be described herein since they -form no part of the present invention. For this reason therefore, I have shown only a pair of field poles 8-6 of laminated iron; an end frame member 7 between which and a shoulder 8 on the frame 3, the pole pieces 6-6 are clamped to support them as by means of screws 9; an armature 10 rotatable within the pole pieces 66; a shaft 11 for the armature; and a bearing 12 for one endof the armature shaft.

- The armature 10 is preferably rigidly sacured upon the shaft 11 by prom fitting or in any of the well known methods and may, as indicated, be of the well known type comace prising a plurality oi l clamped between end plates shait is preferably eiement ciosed at K H 1 a h clearance space 13 province c educed "aortiou l2 eztreme end which renas nearing support in a in; bore 13 in a screw threaded hearing 19 a y lily threaded into the lionsthe shaft 11 in any suitable mermer is a driving worm .25. Mounted in th housing l. suitable bearing, not shown, is e. s 23 carrying a worm wheel 2? meshed with the worm 25, and the shaft 23 he pro jected out of the housing'l through suitable bearings therein, not shown, to transmit power from the worm 25 to drive mech nisms which it is desired to have driven by the motor. If desired, other gearing within the housingv 1 may be provided to step up or step down the rota-- tional velocity of the worm 25.

To govern or control to a substantially constant value the velocity of the shaft 1 the following governing mechanism is provided. Upon the shaft is secured a head 27 as by a set screw 28. The head is preferably conical .or pyramidal and has secured on its sloping sides as by screws 29, a plurality, such as two, fiat springs 30, one end of each spring being secured to the head 27 andthe spring ranging axially of the shaft and secured at its other end as by screws 31 too. head 32 simi-.

lar to the head 27. r The head 32 has an axially ranging extension 33 thereon. The extension 33 andhead 32 are bored out as at 34'to have sliding fit on the shaft 11 which passes axially therethrough. Secured to the head 32 in any suitable manner is a disk 35 having a plannlar face 36 at right angles to the shaft 11. Mounted on each of the springs in any suitable manner as by rivets 38 and substantially mid-way between the ends 01 the springs 30 are ccntriiugal weights 37.

In the operation of the governing mechanism thus far described, it will be apparent that upon rotation of the shaft 11, the her. 2? rotating with the shaft will cause the springs 30 and weights 3? to rotate around the axis of the shaft, and the latter by centrifugal force will move outward radially and draw thehead 32 toward the head 2?, the extension 33 guiding the movement of the head 32; and the dish wiil move with the head 32 axially along shaft, and the extension 33 will the planular face 36 of the dish 35 in a plane at right angies to the axis of the shaft.

Supported by a oi the housing 1 is a brake shoe 40, in position to be engaged by the planular 36 of the disk when the latter moves, as above described. The shoe 40 may be composed of any suitable material such as felt, leather or the like, and. be supported in any suitable manner. The support for the shoe illust ated comprises a stud d1 adjustably threaded in the wall of the housing l and provided with a pair of clamp nuts 1-2 between which the shoe 3.4] is clamped. The radial position the shoe 40 with respect to the dish 35 may be adjusted by means of the threaded stud In operation, the axial movement of the disk 35 due to rotation of the shait 11 will bring the planular face 36 into contact with a suitable surface 43 on. the shoe i0 and the friction thereby generated will tend to retard the rotation 01" the disk 35 in a well known manner, tending to reduce the speed thereof. A reduction or speed. of the disk 35 will reduce the speed of the shaft 11 and permit 7 the springs 30 to retract the weights 37 and thus cause the disk 35 to tend to move axially away from the shoe 40 thus tending to permit its speed to increase again. By this action the speed of the disk'35 and shaft 11 is maintained constant and power transmitted from the worm 25 to driven apparatus will be at a constant speed, as will be understood. 1

To adjust the constant speed thus attained, the threaded bearing 20 may be screwed toward the left or toward the right axially and will have the effect of increasmg or decreasing respectively the friction between the disk 35 and shoe 40 and thus will cause the governing mechanism, as above described, to regulate to a constant lower or higher speed respectively. The graduated scale 45 on the disk 22 may be calibrated in terms of speeds so that the speeds of the motor may be determined or lndicated as the bearing 20 is adjustably rotated.

In the device above described, there is a axial or end wise thrust of the shaft 11 toward the right and this is taken up by the extreme and 46 of the reduced portion 17 of the shaft engaging the bottom of the bore 18 in the bearing portion 19. By means of said end thrust, the governing device above described is caused to govern at a high degree right as illustrated. Also, by constructing the armature in relation to its fields 6-6 it may exert an end thrust in the right hand direction as illustrated, one means being to project the armature 10 axially out of the enclosing iield poles at greater distance at its left end as at a: than on its right end as at y.

Also, by positioning the shoe on the left hand side of the disk 35, its engagement with i the disk 35 will react to thrust the disk 35 toward the right.

It is one of the important advantages of my invention that the armature 16, governing mechanism and worm 25 may all be mounted on the shaft 11a) form a unitary structure to facilitate manufacture and assembly operations and that the speed adjustof the governing mechanism may be obtained by simply moving the entire shaft assemhly, thus constructed, axially, one of the shaft hearings being provided to take up axial end thrust and the other being provided with clearance to permit axial movement for these purposes.

My invention is not limited to the exact details of construction shown and described, since my invention may be embodied in other and various structures without departing from the spirit of my invention or sacrificits advantages. v

I claim:

1. in a speed governing mechanism, a ro- Jtatably mounted shaft, means for rotating the shaft, and means for regulating the speed of rotation of the shaft to a substantially constant value, said means including an end thrust stop for the shaft, a rotary element mounted to rotate with the shaft and axially movable thereon, centrifugal meansfor moving the rotary element axially of the shaft in response to variations of shaft speed and a brake element engageable by the rotary'relement upon axial movement of the element in one direction, and means for adjustably vary ing said constant speed including operable .means for adjustably moving said stop axially, and indicating means for determining the adjusted position of the stop.

2. In a speed governing mechanism, a rotatably mounted shaft, means for rotating the shaft, a worm on the shaft adapted to transmit power to mechanism to be driven thereby, means for maintaining substantially constant the rotational velocity of the shaft, @said means including an end thrust stop for the shaft, a rotational element mounted for rotation with the shaft and axially movable thereon, centrifugal means for moving the rota- .tional element axially in response to variations of shaft velocity, a brake shoe adapted to be frictionally engaged by the rotary element upon axial movement thereof in one direction, the lead angle of said worm being in the direction to cause the worm when transmitting power to exert an end thrust on the shaft toward said stop, and means for adjustably changing said shaft velocity including operable means for adjustably moving the shaft and worm bodily axially and indicating means for determining the adjusted position of the shaft.

3. In a speed governing mechanism, a mcitor shaft, a motor rotor thereon, a motor stator, the shaft being mounted for rotation and for axial movement, an end thrust stop for the shaft, means for regulating the shaft speed to a substantially constant value including rotary element mounted for rotation with the shaft and axially movable thereon, a centrifugal means for moving the rotary element axially of the shaft in response to speed variations of the shaft, a brake shoe engageahle by the rotary element upon movement thereof in one direction axially and means for selectively varying the said constunt speed including operable means for moving said end thrust stop in the axial direction of the, shaft and means for indicating the adj usted pom'tion of the shaft.

2. in a speed governing mechanism, a rotary shaft, a motor rotor on the shaft, a motor stator cooperating therewith to rotate the 1 shaft, the shaft being supported for rotational and axial movement, means for regulating the variations of shaft s eed, including a rotary element rotatable with the shaft and movable axially thereon c'entrifugal means for moving the rotary element axially, a shoe engageable by the rotary element by movement thereof axially in one direction and means for selectively varying the velocity of the shaft including operable means for bodily moving the shaft axially and means for indicating the axial position of the shaft.'

5. In a speed governing mechanism, a motor shaft, a motor rotor on the shaft, a motor stator' cooperating therewith to rotatably drive the shaft, a worm on the shaft for transmitting power therefrom, the shaft be- 4 ing mounted for rotation and for movement axially, an end thrust stop for the shaft,

means for regulating the velocity of the shaft end thrust flop by the joint reaction of the motor rotor on its stator, the reaction of the shoe on the rotary element and the reaction or" said Worm, and means to selectively very said constant speed, said means inchid' operahie means for adjust'abiy moving sai end thrust stop in the axiai direction of the shaft and indicating means for indicating the adjusted axial position of the shaft.

6. in a speed governing mechanism, a 20- tatably mounted shaft, means for rotating the shaft, and means for regulating the speed of rotation of the shaft to a substantially constant value, said means inciuding a rotary element mounted to rotate with the shaft and axially movable thereon, centrifugal means for moving the rotary element-axially of the shaft in response to variations of shaft speed and a brake element engageabie by the rotary element upon axial movement of the element in one direction, and means for adjustahiy varying said constant speed including a rotatable screw means for adjustabiy moving the shaft hodiiy in the direction of its axis and an indicator movable With the screw for indicating its rotative position.

in testimony whereof E hereunto affix my signature this 9th day of September, 1929.

LE RQY WQTTBING.

aseaeea 

